Followed specifications

This page lists Internet Standards and other specifications followed by maddy along with any known deviations.

Message format

• RFC 2822 - Internet Message Format
• RFC 2045 - Multipurpose Internet Mail Extensions (MIME) (part 1)
• RFC 2046 - Multipurpose Internet Mail Extensions (MIME) (part 2)
• RFC 2047 - Multipurpose Internet Mail Extensions (MIME) (part 3)
• RFC 2048 - Multipurpose Internet Mail Extensions (MIME) (part 4)
• RFC 2049 - Multipurpose Internet Mail Extensions (MIME) (part 5)

• RFC 6532 - Internationalized Email Headers

• RFC 2183 - Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field

IMAP

• RFC 3501 - Internet Message Access Protocol - Version 4rev1
  • Partial: \Recent flag is not reset sometimes.
• RFC 2152 - UTF-7

Extensions

• RFC 2595 - Using TLS with IMAP, POP3 and ACAP
• RFC 7889 - The IMAP APPENDLIMIT Extension
• RFC 3348 - The Internet Message Action Protocol (IMAP4). Child Mailbox Extension
• RFC 6851 - Internet Message Access Protocol (IMAP) - MOVE Extension
• RFC 6154 - IMAP LIST Extension for Special-Use Mailboxes
  • Partial: Only SPECIAL-USE capability.
• RFC 5255 - Internet Message Access Protocol Internationalization
  • Partial: Only I18NLEVEL=1 capability.
• RFC 4978 - The IMAP COMPRESS Extension
• RFC 3691 - Internet Message Access Protocol (IMAP) UNSELECT command
• RFC 2177 - IMAP4 IDLE command
• RFC 7888 - IMAP4 Non-Synchronizing Literals
  • LITERAL+ capability.
• RFC 4959 - IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response

SMTP

• RFC 2033 - Local Mail Transfer Protocol
• RFC 5321 - Simple Mail Transfer Protocol
• RFC 6409 - Message Submission for Mail

Extensions

• RFC 1870 - SMTP Service Extension for Message Size Declaration
• RFC 2920 - SMTP Service Extension for Command Pipelining
  • Server support only, not used by SMTP client
• RFC 2034 - SMTP Service Extension for Returning Enhanced Error Codes
• RFC 3207 - SMTP Service Extension for Secure SMTP over Transport Layer Security
• RFC 4954 - SMTP Service Extension for Authentication
• RFC 6152 - SMTP Extension for 8-bit MIME
• RFC 6531 - SMTP Extension for Internationalized Email

Misc

• RFC 6522 - The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages
• RFC 3464 - An Extensible Message Format for Delivery Status Notifications
• RFC 6533 - Internationalized Delivery Status and Disposition Notifications

Email security

User authentication

• RFC 4422 - Simple Authentication and Security Layer (SASL)
• RFC 4616 - The PLAIN Simple Authentication and Security Layer (SASL) Mechanism

Sender authentication

• RFC 6376 - DomainKeys Identified Mail (DKIM) Signatures
• RFC 7001 - Message Header Field for Indicating Message Authentication Status
• RFC 7208 - Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
• RFC 7372 - Email Authentication Status Codes
• RFC 7479 - Domain-based Message Authentication, Reporting, and Conformance (DMARC)
  • Partial: No report generation.
• RFC 8301 - Cryptographic Algorithm and Key Usage Update to DomainKeys Identified Mail (DKIM)
• RFC 8463 - A New Cryptographic Signature Method for DomainKeys Identified Mail (DKIM)
• RFC 8616 - Email Authentication for Internationalized Mail

Recipient authentication

• RFC 4033 - DNS Security Introduction and Requirements
• RFC 6698 - The DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS) Protocol: TLSA
• RFC 7672 - SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)
• RFC 8461 - SMTP MTA Strict Transport Security (MTA-STS)

Unicode, encodings, internationalization

• RFC 3492 - Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)
• RFC 3629 - UTF-8, a transformation format of ISO 10646
• RFC 5890 - Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework
• RFC 5891 - Internationalized Domain Names for Applications (IDNA): Protocol
• RFC 7616 - Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords
• RFC 8264 - PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols
• Unicode 11.0.0
  • UAX #15 - Unicode Normalization Forms

There is a huge list of non-Unicode encodings supported by message parser used for IMAP static cache and search. See Unicode support page for details.

Misc

• RFC 5782 - DNS Blacklists and Whitelists